Until they have their own design, Apple would be wise to continue dual-sourcing the modems. Apple is heavily subsidizing Intel's R&D until they can bootstrap their own.
Apple can make their premium offering Qualcomm's 5G and have the tier(s) below that be Intel's LTE.
My bet would be they diversify their sourcing, if they can. In the FTC case Apple stated that they wanted to buy 4G modems from Qualcomm, but Qualcomm refused unless they were exclusive.
Apple can make their premium offering Qualcomm's 5G and have the tier(s) below that be Intel's LTE.